/*
 * Copyright (C) 2021 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.cv4j.rxcv4j.util;

import io.reactivex.rxjava3.annotations.NonNull;
import io.reactivex.rxjava3.core.Single;
import io.reactivex.rxjava3.core.SingleSource;
import io.reactivex.rxjava3.core.SingleTransformer;
import io.reactivex.rxjava3.openharmony.schedulers.OpenHarmonySchedulers;
import io.reactivex.rxjava3.schedulers.Schedulers;

/**
 * rx java跑龙套
 *
 * @since 2021-05-17
 */
public class RxJavaUtils {
    /**
     * 单一主
     *
     * @return {@link SingleTransformer<T, T>}
     */
    public static <T> SingleTransformer<T, T> singleToMain() {
        return new SingleTransformer<T, T>() {
            @Override
            public @NonNull SingleSource<T> apply(@NonNull Single<T> upstream) {
                return upstream.subscribeOn(Schedulers.io())
                    .observeOn(OpenHarmonySchedulers.mainThread());
            }
        };
    }
}
